6840681 has 16 divisors (see below), whose sum is σ = 9751104. Its totient is φ = 4250624.

The previous prime is 6840661. The next prime is 6840721. The reversal of 6840681 is 1860486.

It is a cyclic number.

It is not a de Polignac number, because 6840681 - 2⁵ = 6840649 is a prime.

It is a super-2 number, since 2×6840681² = 93589833087522, which contains 22 as substring.

It is a Smith number, since the sum of its digits (33) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is an Ulam number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (6840661) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 5170 + ... + 6356.

It is an arithmetic number, because the mean of its divisors is an integer number (609444).

Almost surely, 2^6840681 is an apocalyptic number.

It is an amenable number.

6840681 is a deficient number, since it is larger than the sum of its proper divisors (2910423).

6840681 is a wasteful number, since it uses less digits than its factorization.

6840681 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1320.

The product of its (nonzero) digits is 9216, while the sum is 33.

The square root of 6840681 is about 2615.4695563130. The cubic root of 6840681 is about 189.8306986794.

The spelling of 6840681 in words is "six million, eight hundred forty thousand, six hundred eighty-one".